The F-117 Nighthawk, an early US stealth platform. Staff Sgt. Aaron Allmon II/DoD Ever since the US used F-117s in 1991 to rock Baghdad, at the time one of the world's most defended cities, Soviets and other potential US adversaries have been studying up on how to counter stealth jets.

Later, over Serbia, an F-117 was shot down, forever souring the image of so-called invisible aircraft that have for decades been on top of the US Air Force's agenda.

While many have rushed to declare stealth a fruitless and expensive path for the US Air Force to walk, retired Marine Maj. Dan Flatley told Business Insider why pilots of America's most expensive weapons system weren't afraid of Russian or Chinese counterstealth.

"Adversaries have to build a kill chain," said Flatley, a former F-35 pilot. Just because a radar can find an object — and Russian VHF radars can spot F-35s — doesn't mean it can fix, track, target, and consummate that kill chain with a missile hit, he said.

"We're not trying to prevent every aspect of that chain, just snap one of those links," Flatley said.

So while an infrared search and tracking system could spot an F-35 and give enemy pilots an idea of where it is, it couldn't track it or target it with a missile. This means that the systems Russia and China have spent millions developing provide only a tiny glimpse of the F-35 — systems that may be sunk costs in the grand scheme of things.

"I don't need to stop everything all the time," Flatley said of the kill chain. "I just need to make you unable to finish what you've already invested tons of time and money and effort in trying to shoot me down."

Lockheed Martin

"That's the thing people don't understand," Flatley said. "They think we're saying we're invisible to everyone all the time, at all bandwidths and energy levels. ... That's not what we're saying."

Flatley says F-35 pilots joke that only Wonder Woman has an invisible jet. The reality is that the F-35 is a huge piece of flying metal and alloy — a radar pointed at the right place at the right time will definitely spot it, but good luck shooting it down.

Meanwhile, as the enemy systems scour the skies for any trace of the F-35, the F-35 sees all of those radar emissions and can pinpoint the air defenses and enemy planes.

Where legacy planes had to choose between lethality and survivability on a mission, the F-35 can do four, 16, or even 32 things at a time, meaning that while air and ground threats look for the stealth jet, the F-35 can drop bombs to smash them, according to Flatley.

"We're extraordinarily confident in what we believe the performance of this jet is, and we have a lot of data and material to back that stuff up," Flatley said.

So while the Russians' propaganda may boast that they can see F-35s, it may be a response to a platform that has rendered parts of their battle plan irrelevant.

The F-35 was built to penetrate the most guarded airspaces in the world and get the job done. While the enemy hasn't been standing still, making great progress toward countering the F-35, Flatley says he's sure the US can carry out its mission on its terms.

"The expectation is that the F-35 will operate in a scenario against air and surface defense systems — and that's an expectation that the American taxpayer and public should have," Flatley said. He also acknowledged the effort the US has put behind the F-35 as a stealth penetrator and was resolute in that "we're not going to waste it."